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D. Store the data in a single BigTable table and set an expiration time on the column families (Correct): Bigtable is a NoSQL database designed for large analytical and operational workloads. It offers a powerful feature called garbage collection, which can be configured at the column family level to set a Time to Live (TTL). This configuration automatically deletes data that exceeds the specified age requirement, providing a granular, automated, and policy-driven way to comply with the data retention regulation.
Bucket lock and TTL are the key features of Cloud Storage.
Cloud Storage life cycle management